The forestry department on Thursday issued warnings to picnickers ahead of Green Monday on March 14, calling on the public to respect the environment.
Green Monday starts the Lenten fasting period and traditionally people take to the fields.
People are urged not to cur wild flowers or plants “since many of them are endemic and strictly protected”.
“The conservation and protection of our natural heritage is the responsibility of all,” a statement said.
The department recommends day trippers keep the area clean and to collect all the garbage they generate on their outings either by placing it in bins or take it with them.
If plastic bags are left behind they could be scattered further afield by stray dogs, cats and foxes, it added.
Also, the public needs to be careful as some pine trees could be infected with a type of caterpillar that eats the bark and could cause skin problems in people.
“The public should be particularly careful to avoid sitting down near infected trees and avoid coming into contact with the larvae,” it said.
Anyone who inadvertently comes into contact with the insect named the pine processionary (Thaumetopoea pityocampa) or its larvae, should seek medical attention, it added.